607 citations · 1.2k across the 14 of their papers we have counts for
15 papers
Imaging real-time amorphization of hybrid perovskite solar cells under electrical biasing
Min-cheol Kim, Namyoung Ahn, Diyi Cheng +11
Perovskite solar cells have drawn much attention in recent years, owing to its world-record setting photovoltaic performances. Despite its promising use in tandem applications and…
Pulsatile therapy for perovskite solar cells
Kiwan Jeong, Junseop Byeon, Jihun Jang +2
The current utmost challenge for commercialization of perovskite solar cells is to ensure long-term operation stability. Here, we developed the pulsatile therapy which can prolong…
Charge transport layer dependent electronic band bending in perovskite solar cells and its correlation to device degradation
Junseop Byeon, Jutae Kim, Ji-Young Kim +4
Perovskite solar cells (PSCs) have shown remarkably improved power-conversion efficiency of around 25%. However, their working principle remains arguable and the stability issue ha…
Sparking mashups to form multifunctional alloy nanoparticles
Jicheng Feng, Dong Chen, Peter V. Pikhitsa +3
Synthesizing unconventional alloys remains challenging owing to seamless interactions between kinetics and thermodynamics. High entropy alloys (HEAs), for example, draw a fundament…
Highly durable crack sensor integrated with silicone rubber cantilever for measuring cardiac contractility in culture media
Dong-Su Kim, Yong Whan Choi, Yun-Jin Jeong +5
We propose a novel cantilever device integrated with a polydimethylsiloxane (PDMS)-encapsulated crack sensor that directly measures the cardiac contractility. The crack sensor was…
Three-dimensional nanoprinting via charged aerosol focusing
Wooik Jung, Yoon-ho Jung, Peter V. Pikhitsa +4
A powerful and flexible method of 3D nano-printing, based on focusing charged aerosol, has been developed. The self-consistent electric field configuration, created with a holey fl…
Decrystallization of CH3NH3PbI3 perovskite crystals via polarity dependent localized charges
Min-cheol Kim, Namyoung Ahn, Eunhak Lim +6
Despite soaring performance of organic-inorganic hybrid perovskite materials in recent years, the mechanism of their decomposition at actual operation condition has been elusive. H…
Atomistic mechanism for trapped-charge driven degradation of perovskite solar cells
Kwisung Kwak, Eunhak Lim, Namyoung Ahn +4
It is unmistakably paradoxical that the weakest point of the photoactive organic-inorganic hybrid perovskite is its instability against light. Why and how perovskites break down un…
A low-field temperature-dependent EPR signal in terraced MgO:Mn2+ nanoparticles: an enhanced Zeeman splitting in the wide-bandgap oxide
Peter V. Pikhitsa, Sukbyung Chae, Seungha Shin +1
Mn2+ ion doping is used as an electron paramagnetic resonance (EPR) probe to investigate the influence of low-coordination structural defects such as step edges at the surface of t…
Trapped charge driven degradation of perovskite solar cells
Namyoung Ahn, Kwisung Kwak, Min Seok Jang +6
Perovskite solar cells have shown fast deterioration during actual operation even with encapsulation, but its mechanism has been elusive. We found the fundamental mechanism for irr…
Formation of non-cubic nanoparticles from cubic MgO in intensified self-burning of magnesium
Sukbyung Chae, Peter V. Pikhitsa, Seungha Shin +3
When Mg metal burns in air the resulting rock-salt MgO smoke consists of perfect [100] cubes of about 100 nm. On contrast, we found that intensification of self-burning of Mg micro…
Electronic modulation of infrared emissivity in graphene plasmonic resonators
Victor W. Brar, Michelle C. Sherrott, Luke A. Sweatlock +4
Electronic control of blackbody emission from graphene plasmonic resonators on a silicon nitride substrate is demonstrated at temperatures up to 250 C. It is shown that the graphen…
Tunable Large Resonant Absorption in a Mid-IR Graphene Salisbury Screen
Min Seok Jang, Victor W. Brar, Michelle C. Sherrott +5
Enhancing the interaction strength between graphene and light is an important objective for those seeking to make graphene a relevant material for future optoelectronic application…
Seven, eight, and nine mutually touching infinitely long straight round cylinders: Entanglement in Euclidean space
Peter V. Pikhitsa, Mansoo Choi
It has been a challenge to make seven straight round cylinders mutually touch before our now 10-year old discovery [Phys. Rev. Lett. 93, 015505 (2004)] of configurations of seven m…
CO2 laser-driven reactions in pure acetylene flow
Peter V. Pikhitsa, Daegyu Kim, Mansoo Choi
We show that multiple-photon absorption of radiation from a 10.56 μm cw CO2 laser by intermediates (ethylene, vinylidene) generated in pure acetylene flow makes them decompose to c…